package com.stx.common;


/*
* 文件上传下载本地
* */


import io.swagger.v3.oas.annotations.Hidden;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import springfox.documentation.annotations.ApiIgnore;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;
@Hidden
@ApiIgnore
@CrossOrigin
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${images.path}")
    private String basePath;

    @PostMapping("/upload")
    public CommonDto<String> upload(@RequestParam("file") MultipartFile file) {
        System.out.println("Uploading file...");
        // 原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        // 使用 UUID 重新生成一个文件名，防止文件名重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        // 创建一个目录
        File dir = new File(basePath);
        if (!dir.exists()) {
            // 如果目录不存在就直接创建
            dir.mkdirs();
        }
        try {
            // 将临时文件转存到指定位置
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }

        CommonDto<String> commonDto = new CommonDto<>();
        commonDto.setCode(200);
        commonDto.setMessage("上传成功");
        commonDto.setContent(Constants.AVATAR_PATH + "/" + fileName);
        return commonDto;
    }



    /*
    * 文件下载
    * */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        System.out.println(basePath + name);

        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            //输出流，通过输出流将文件内容写入到浏览器，在浏览器中展示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
            //关闭资源
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e){
            e.printStackTrace();
        }


    }

}
